Most of the reseach show that there is a positive correlation between news cardinality and trade volume plus volatility. Liang (2006) defined the web stock news volumes (WSNV) indicator and measured the impact of it on financial market behavior. He classified news according to direct and indirect aspects: direct news comes from a dedicated site containing the current news of a certain company; indirect news: company is mentioned on an other news site. His main conclusion is that significant increases of web stock news volumes are linked with the significant changes of stock prices. These findings are in line with.
